CN110048730B - Tracking receiver channel compatible with two tracking systems - Google Patents
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- CN110048730B CN110048730B CN201910251547.1A CN201910251547A CN110048730B CN 110048730 B CN110048730 B CN 110048730B CN 201910251547 A CN201910251547 A CN 201910251547A CN 110048730 B CN110048730 B CN 110048730B
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Abstract
A tracking receiver channel compatible with two tracking systems is characterized in that under a single-channel single-pulse tracking mode, a sum branch signal and a difference branch signal are respectively amplified by a sum branch low-noise amplification module and a difference branch low-noise amplification module and then enter a tracking modulation module to form an amplitude modulation signalPulsing the single channel signal. The gains of the first intermediate frequency amplification module and the second intermediate frequency amplification module are controlled by the closed-loop AGC, and the telemetering voltage V of the closed-loop AGC is output at the same timeAGCTM1Used for catching, losing the lock judgement; and in an extreme value tracking mode, the difference branch low noise amplification module is not operated when the power is cut off, and the sum branch low noise amplification module amplifies the sum signal and then passes through the tracking modulation module. The gains of the first intermediate frequency amplification module and the second intermediate frequency amplification module are controlled by gain control voltage input from outside in an open-loop stepping way, and open-loop AGC telemetering voltage V with large slope is output at the same timeAGCTM2For extreme tracking decisions. The invention has simple realization and high reliability, and is compatible with two tracking systems of single-channel single-pulse tracking and extreme value tracking.
Description
Technical Field
The invention relates to a tracking receiver channel compatible with two tracking systems, which is suitable for a single-channel single-pulse angle tracking system and an extreme value tracking system and belongs to the technical field of radio tracking measurement.
Background
The single-channel single-pulse tracking system adopts the difference signal to track, drives the antenna to rotate towards the direction that the difference signal is reduced, has high tracking precision, but the tracking performance is influenced by the difference beam amplitude and phase characteristic variation, and can not automatically track in serious cases. And the extremum tracking carries out increase and decrease judgment according to the received sum signal power, drives the antenna to rotate towards the direction of increasing the signal power, and has low tracking precision but relatively low requirement on the antenna performance.
The second-generation relay satellite inter-satellite link antenna in China adopts a mesh reflecting surface, the working frequency band is high, the caliber is large, and the shape surface precision of the reflecting surface is difficult to guarantee. The shape surface precision is poor, the sum beam gain is reduced, the amplitude-phase characteristic of the poor beam is poor, the single-channel single-pulse tracking precision is affected, and the tracking cannot be realized in serious cases. In order to ensure the reliable operation of a second-generation relay satellite acquisition tracking system in orbit, a single-channel single-pulse angle tracking and extreme value tracking combined acquisition tracking mode is designed, the single-channel single-pulse angle tracking mode is mainly used in the orbit, and if the surface precision of an antenna reflection surface causes poor beam distortion to influence the tracking performance, the tracking mode is switched to the extreme value tracking mode.
The relay satellite needs to complete the tracking of different relay user terminals, and the modulation modes, code rates and transmitting powers of data transmission signals of different relay user terminals are different, so that the dynamic range of the signal level of the input end of the relay satellite tracking receiver is more than or equal to 40dB, the resolution of AGC telemetering voltage values of the original tracking receiver, which are used for representing the signal power, is low, and the tracking precision is directly influenced in an extreme value tracking mode.
In order to avoid increasing the number of on-satellite equipment, a receiver channel compatible with two tracking systems of single-channel single-pulse tracking and extreme value tracking is urgently needed to be designed, and switching is performed under two working modes through instructions so as to adapt to the new requirements of the second-generation relay satellite.
The existing implementation method of the receiver which can be compatible with single-channel single-pulse tracking and extremum tracking is as follows: after the radio frequency signal modulated by the single channel is subjected to frequency conversion and amplification to intermediate frequency, the logarithmic power, the signal-to-noise ratio, the azimuth error voltage and the pitching error voltage of a target signal are obtained through a digital signal processor control demodulator and a digital down converter in a digital demodulation unit and a digital signal processing algorithm. The method mainly has the following disadvantages: the AGC telemetering value of the nominal input signal power for single-channel single-pulse tracking and extreme value tracking is obtained by the same method, and when the dynamic range of the input signal level is large, the AGC telemetering resolution is low, and the extreme value tracking precision is influenced. Therefore, it is not suitable for the extreme value tracking mode with a large dynamic range of the input signal level.
Disclosure of Invention
The invention content of the invention is as follows: the tracking receiver channel has the advantages of overcoming the defects of the prior art, adapting to a large input signal level dynamic range and being compatible with two tracking systems of single-channel single-pulse tracking and extreme value tracking.
The technical solution of the invention is as follows: a tracking receiver channel compatible with two tracking systems comprises a sum branch low-noise amplification module, a difference branch low-noise amplification module, a tracking modulation module, a frequency conversion and amplification module, a power division module, an AGC detection module, an envelope detection module, an operational amplifier A, an operational amplifier B, an operational amplifier C, an alternative switch A and an alternative switch B;
when the alternative switch A is switched to output closed-loop AGC voltage, the alternative switch B is switched to output closed-loop AGC telemetering voltage VAGCTM1When the channel enters a single-channel single-pulse tracking mode, the alternative switch A outputs AGC voltage V at the momentAGCThe frequency conversion and amplification module is used for realizing gain closed-loop control; either-or switch B outputs closed-loop AGC telemetering voltage VAGCTM1Used for catching, losing the lock judgement;
when the alternative switch A is switched to output the gain control voltage and the alternative switch B is switched to output the open-loop AGC telemetering voltage VAGCTM2When the channel enters an extreme value tracking mode, the alternative switch A outputs gain control voltage to the frequency conversion and amplification module to realize gain open-loop control; the alternative switch B outputs open loop AGC remote measuring voltage VAGCTM2The method is used for extreme value tracking judgment;
the sum branch low-noise amplification module performs low-noise amplification on the sum signal sigma and outputs the sum signal sigma to the tracking modulation module; the difference branch low-noise amplification module performs low-noise amplification on the difference signal delta and outputs the difference signal delta to the tracking modulation module;
in a single-channel single-pulse tracking mode, a tracking modulation module performs phase shift modulation processing on the received sum signal and difference signal to obtain an amplitude-modulated single-channel single-pulse signal, and outputs the amplitude-modulated single-channel single-pulse signal to a first frequency mixing module; in an extreme value tracking mode, the tracking modulation module is only used as a channel of a sum signal, and the received sum signal is directly output to the first frequency mixing module;
the frequency conversion and amplification module performs frequency conversion and gain amplification processing on an output signal of the tracking modulator by using an externally input local oscillator signal to obtain an intermediate frequency signal IF, and outputs the intermediate frequency signal IF to the power division module;
the power division module divides the IF equal power into two paths, one path is an IF1 signal, and the two paths are output to the AGC detection module; the other path is an intermediate frequency signal IF2 which is output to an envelope detection module;
the AGC detection module detects the power of an input intermediate frequency signal IF1 to obtain a direct current voltage which is in direct proportion to the power of the input signal, and the direct current voltage is simultaneously output to an operational amplifier A, an operational amplifier B and an operational amplifier C for amplification;
an envelope detection module removes a carrier wave of the intermediate frequency signal IF2, extracts an angle error signal envelope, and outputs an angle error signal after amplification;
the operational amplifier A operates and amplifies the DC voltage output by the AGC detection module and outputs a closed-loop AGC voltage V to the alternative switch AAGC(ii) a The operational amplifier B operates and amplifies the direct current voltage output by the AGC detection module and outputs a closed-loop AGC telemetering voltage V to the alternative switch BAGCTM1(ii) a The operational amplifier C operates and amplifies the DC voltage output by the AGC detection module and outputs an open-loop AGC telemetering voltage V to the alternative switch BAGCTM2。
The frequency conversion and amplification module comprises a first frequency mixing module, a first intermediate frequency amplification module, a second frequency mixing module and a second intermediate frequency amplification module;
under single-channel single-pulse tracking mode, the alternative switch A outputs AGC voltage VAGCThe first intermediate frequency amplification module and the second intermediate frequency amplification module realize gain closed-loop control;
under an extreme value tracking mode, the alternative switch A outputs gain control voltage to the first intermediate frequency amplification module and the second intermediate frequency amplification module to realize gain open-loop control;
the first frequency mixing module performs signal down-conversion on an output signal of the tracking modulator by using a first local oscillator signal input from the outside to obtain a first intermediate frequency signal, and outputs the first intermediate frequency signal to the first intermediate frequency amplification module;
the first intermediate frequency amplification module performs gain amplification on the first intermediate frequency signal and outputs the first intermediate frequency signal to the second frequency mixing module;
the second mixing module performs signal down-conversion on an output signal of the first intermediate frequency amplification module by using a second local oscillator signal input from the outside to obtain a second intermediate frequency signal, and outputs the second intermediate frequency signal to the second intermediate frequency amplification module;
the second intermediate frequency amplification module performs gain amplification on the received signal to obtain an intermediate frequency signal IF, and outputs the intermediate frequency signal IF to the power division module.
The tracking modulation module comprises a sum channel phase shifter, a difference channel modulator and a combiner;
in a single-channel single-pulse tracking mode, a sum channel phase shifter completes phase shift within a range of 0-360 degrees of a sum signal according to an external instruction; the difference channel modulator performs four-phase modulation on the input difference signal under the control of reference signals f1(t) and f2 (t); the combiner adds the sum signal and the difference signal after the phase shift and the modulation to form an amplitude modulation single-channel single-pulse signal;
in the extreme value tracking mode, the difference channel modulator in the tracking modulation module does not work, the sum channel phase shifter is arranged at a fixed phase, and the tracking modulator is only used as a channel of the sum branch signal.
The timing sequence of four-phase modulation of the input difference signal by the difference channel modulator is 0 ° - >90 ° - >270 ° - >180 °.
The reference signals f1(t) and f2(t) are phase coherent square wave signals with a duty cycle of 50%, and the frequency of f1(t) is 2 times that of f2 (t).
The difference signal delta is a difference signal output by the antenna feed source, is a vector sum of the azimuth difference signal delta A and the elevation difference signal delta E, and is orthogonal to delta A and delta E.
The sum signal Σ is a sum signal of the feed output, Σ being in phase with Δ a, Δ E being perpendicular to Δ a.
The single-channel single-pulse tracking mode is realized as follows:
(d1) the ground sends a working mode switching instruction to switch the alternative switch A to output a closed-loop AGC voltage VAGCSwitching the alternative switch B to output a closed loop AGC telemetry voltage VAGCTM1；
(d2) The sum signal sigma passes through the sum branch low-noise amplification module, the difference signal delta passes through the difference branch low-noise amplification module, and then enters the tracking modulation module, and the tracking modulation module outputs an amplitude-modulated single-pulse single-channel signal after processing;
(d3) the amplitude-modulated single-pulse single-channel signal sequentially passes through a first mixing module, a first intermediate-frequency amplification module, a second mixing module and a second intermediate-frequency amplification module and then outputs an intermediate-frequency signal IF;
(d4) the intermediate frequency signal IF passes through a power division module and is divided into an intermediate frequency signal IF1 and an intermediate frequency signal IF 2;
(d5) the intermediate frequency signal IF1 enters an AGC detection module to obtain a direct current voltage, and the direct current voltage is amplified by an operational amplifier A to generate a closed-loop AGC voltage VAGCThe gain of the first intermediate frequency amplification module and the gain of the second intermediate frequency amplification module are controlled, and automatic closed-loop control of the equipment gain is realized; the direct current voltage obtained by the AGC detection module is amplified by an operational amplifier B to generate a closed-loop AGC telemetering voltage VAGCTM1Outputting the data as a judgment basis of system capture and lock loss;
(d6) the intermediate frequency signal IF2 enters the envelope detection module 10, and the angle error signal is detected and output.
The extreme value tracking mode is realized as follows:
(j1) the ground sends a working mode switching instruction, switches the alternative switch A to output gain control voltage, and switches the alternative switch B to output open-loop AGC telemetering voltage VAGCTM2(ii) a Meanwhile, a power-off instruction of the differential branch low-noise amplification module is sent on the ground;
(j2) according to the characteristics and the level range of a target signal, externally inputting a gain control voltage to control the gains of the first intermediate frequency amplification module and the second intermediate frequency amplification module;
(j3) the sum signal sigma sequentially passes through a sum branch low-noise amplification module, a tracking modulation module, a first frequency mixing module, a first intermediate frequency amplification module, a second frequency mixing module and a second intermediate frequency amplification module, and an intermediate frequency signal IF is output;
(j4) the intermediate frequency signal IF passes through a power division module and is divided into two paths of intermediate frequency signals IF1 and intermediate frequency signals IF 2;
(j5) the intermediate frequency signal IF1 enters an AGC detection module to obtain a direct current voltage, and the direct current voltage is amplified by an operational amplifier C to generate an open-loop AGC telemetering voltage VAGCTM2And outputting the signal as a judgment basis for the rotation of the extreme value tracking antenna;
(j6) the intermediate frequency signal IF2 enters the envelope detection module and the output signal is not further processed.
In the step (j2), a specific method of gain control is as follows:
the input sum signal Σ is stepped in a dynamic range, each step mdB corresponding to a respective gain control voltage; injecting a gain control voltage according to the characteristics of a target signal to be tracked, controlling the channel gains of the first intermediate frequency amplification module and the second intermediate frequency amplification module, and ensuring that the IF power of an intermediate frequency signal output by the second intermediate frequency amplification module in each level mdB of an input sum signal is more than or equal to 9 dBm; m is a natural number other than 0.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts the method of switching the closed-loop AGC and the open-loop gain control to realize the receiver compatible with the single-channel single-pulse tracking system and the extreme value tracking system, and has simple realization and high reliability;
(2) the invention adopts a method of combining gain step control and AGC detection in an extreme value tracking mode, and improves the output AGC telemetering voltage VAGCTM2The resolution of (2) is suitable for the large dynamic range of the input signal.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a schematic diagram of reference signals f1(t) and f2 (t).
Detailed Description
The invention adopts a method of switching closed-loop AGC and open-loop gain control to realize a tracking receiver channel compatible with two tracking systems, and a schematic block diagram is shown in figure 1.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. The specific implementation is based on, but not limited to, the following conditions:
the frequency of the input sum signal and the difference signal is 26 GHz; when the antenna deviates from half beam width, the sum signal power output to the channel is within the range of-100 dBm to-60 dBm, and the difference signal power ratio and the signal power are lower by 5dB as an example:
the specific implementation mode is as follows:
as shown in fig. 1: the invention relates to a tracking receiver channel compatible with two tracking systems, which consists of a sum branch low-noise amplification module 1, a difference branch low-noise amplification module 2, a tracking modulation module 3, a frequency conversion and amplification module, a power division module 8, an AGC detection module 9, an envelope detection module 10, an operational amplifier A11, an operational amplifier B12, an operational amplifier C13, an alternative switch A14 and an alternative switch B15. The frequency conversion and amplification module comprises a first frequency mixing module 4, a first intermediate frequency amplification module 5, a second frequency mixing module 6 and a second intermediate frequency amplification module 7.
The alternative switch A14 realizes the output of the gain control voltage and the output of the AGC voltage V under the control of the externally input working mode switching instructionAGCAnd the output voltage is output to the first intermediate frequency amplification module 5 and the second intermediate frequency amplification module 7, so that gain control is realized. In single-channel single-pulse tracking mode, output VAGCTo the first intermediate frequency amplification module 5 and the second intermediate frequency amplification module 7, to realize gain closed-loop control; and in an extreme value tracking mode, outputting gain control voltage to the first intermediate frequency amplification module 5 and the second intermediate frequency amplification module 7 to realize gain open-loop control.
The alternative switch B15 realizes the output of the remote measuring voltage V of the closed-loop AGC under the control of the switching instruction of the working modeAGCTM1And outputs an open loop AGC telemetry voltage VAGCTM2The handover of (2). Outputting a closed-loop AGC telemetering voltage V under a single-channel single-pulse tracking modeAGCTM1Used for catching, losing the lock judgement; in extreme tracking mode, an open-loop AGC telemetry voltage V is outputAGCTM2For extreme tracking decisions.
When the channel works in a single-channel single-pulse tracking mode, the alternative switch A is switched to output closed-loop AGC voltage, and the alternative switch B is switched to output closed-loop AGC telemetering voltage VAGCTM1(ii) a When the channel works in an extreme value tracking mode, the alternative switch A is switched to output a gain control voltage, and the alternative switch B is switched to output an open-loop AGC telemetering voltage VAGCTM2。
The alternative switch A14 is switched synchronously with the alternative switch B15.
The sum branch low-noise amplification module 1 and the difference branch low-noise amplification module 2 are low-noise amplification modules with the same design, the gain is more than or equal to 40dB, the noise coefficient is less than or equal to 2.5dB, and the modules can independently power on and off through external instructions. The sum branch low-noise amplification module 1 performs low-noise amplification on the sum signal Σ, and the difference branch low-noise amplification module 2 performs low-noise amplification on the difference signal Δ. And the signals amplified by the sum branch low-noise amplification module 1 and the difference branch low-noise amplification module 2 are output to the tracking modulation module 3. The difference signal delta is a difference signal output by the antenna feed source, is a vector sum of the azimuth difference signal delta A and the pitching difference signal delta E, and is orthogonal to the delta A and the delta E; the sum signal Σ is the sum signal of the feed output. Σ is in phase with Δ a, Δ E is perpendicular to Δ a (i.e., also Σ).
The tracking modulation module 3 is composed of a sum channel phase shifter 31, a difference channel modulator 32, and a combiner 35. In a single-channel single-pulse tracking mode, the sum channel phase shifter 31 completes phase shift within the range of 0-360 degrees of the sum signal according to an external instruction; the difference channel modulator 32 performs four-phase modulation on the input difference signal under the control of the reference signals f1(t) and f2(t), and the modulation time sequence is 0 ° - >90 ° - >270 ° - >180 °; the combiner 33 adds the sum signal and the difference signal to form an amplitude-modulated single-channel single-pulse signal. In the extremum tracking mode, the difference channel modulator 32 is not operated, and the sum channel phase shifter 31 is set to a fixed phase, and the tracking modulator 3 is used only as a channel of the sum branch signal.
As shown in fig. 2, the reference signals f1(t) and f2(t) are phase-coherent square-wave signals with a duty ratio of 50%, the frequency of f1(t) is 2 times that of f2(t), and the frequency of f1(t) ranges from several hundred Hz to several kHz. For example, the frequency of f1(t) may be 1kHz and the frequency of f2(t) may be 500 Hz.
The first frequency mixing module 4 adopts a double-balanced frequency mixer, the gain is more than or equal to-10 dB, the frequency of a first local oscillation signal input from the outside is 22GHz, the signal power is 7dBm, and the frequency of a first intermediate frequency signal is output to be 4 GHz. The first frequency mixing module 4 performs signal down-conversion on the output signal of the tracking modulator 3 by using a first local oscillation signal input from the outside to obtain a first intermediate frequency signal, and outputs the first intermediate frequency signal to the first intermediate frequency amplifying module 5.
The first intermediate frequency amplification module 5 is a VGC amplification module, and consists of an amplifier and an electrically-tuned attenuator, wherein the maximum gain is more than or equal to 30dB, and the gain control range is more than or equal to 20 dB. The first intermediate frequency amplifying module 5 performs gain amplification on the first intermediate frequency signal and outputs the first intermediate frequency signal to the second frequency mixing module 6.
The second frequency mixing module 6 adopts a double-balanced frequency mixer, the gain is more than or equal to-8 dB, the frequency of a second local oscillator signal input from the outside is 3.93GHz, the signal power is 7dBm, and the frequency of a second intermediate frequency signal is output to be 70 MHz. The second frequency mixing module 6 performs signal down-conversion on the output signal of the first intermediate frequency amplification module 5 by using a second local oscillator signal input from the outside to obtain a second intermediate frequency signal, and outputs the second intermediate frequency signal to the second intermediate frequency amplification module 7.
The second intermediate frequency amplification module 7 is a VGC amplification module, and consists of an amplifier and an electrically-tuned attenuator, the maximum gain is more than or equal to 30dB, and the gain control range is more than or equal to 20 dB. The second intermediate frequency amplification module 7 performs gain amplification on the received signal to obtain an intermediate frequency signal IF, and outputs the intermediate frequency signal IF to the power division module 8.
The power dividing module 8 divides the intermediate frequency signal IF into two paths of equal power, wherein one path of equal power is an intermediate frequency signal IF1 and outputs the intermediate frequency signal IF1 to the AGC detection module 9; the other path is an intermediate frequency signal IF2, which is output to the envelope detection module 10.
The AGC detection module 9 detects the power of the input intermediate frequency signal IF1, obtains a dc voltage representing the power of the input signal, and outputs the dc voltage to the operational amplifier a 11, the operational amplifier B12, and the operational amplifier C13 for amplification.
The envelope detection module 10 extracts an intermediate frequency signal IF2 angular error signal envelope, and outputs an angular error signal after amplification;
the operational amplifier A11 completes the operational amplification of the direct-current voltage output by the AGC detection module 9, the closed-loop control of the channel gain under the single-channel single-pulse tracking mode is realized, the input sum signal power is in the range of-100 dBm to-60 dBm, and the level of a second intermediate-frequency signal output by the second intermediate-frequency amplification module 4 is 9dBm to 11 dBm.
The operational amplifier B12 completes the operational amplification of the direct current voltage output by the AGC detection module 9 and outputs a closed-loop AGC telemetering voltage V under a single-channel single-pulse tracking modeAGCTM1In the range of 0-5V.
The operational amplifier C13 completes the operational amplification of the DC voltage output by the AGC detection module 9, and outputs open loop in the extreme value tracking modeAGC telemetry voltage VAGCTM2In the range of 0-5V.
Specifically, the two operation modes of the receiver of the present invention are as follows:
(1) single channel single pulse tracking mode
(d1) The ground sends a working mode switching instruction to switch the alternative switch A14 to output a closed-loop AGC voltage VAGCSwitching the alternative switch B15 to output a closed loop AGC telemetry voltage VAGCTM1；
(d2) The sum signal sigma and the difference signal delta respectively pass through the sum branch low-noise amplification module 1 and the difference branch low-noise amplification module 2 and then enter the tracking modulation module 3, and the tracking modulation module 3 outputs an amplitude-modulated single-pulse single-channel signal after processing;
(d3) after the amplitude-modulated single-pulse single-channel signal passes through the first mixing module 4, the first intermediate-frequency amplification module 5, the second mixing module 6 and the second intermediate-frequency amplification module 7, the output frequency is 70MHz, and the signal power is
And intermediate frequency signals IF of 9dBm to 11 dBm.
(d4) The intermediate frequency signal IF passes through the power division module 8 and is divided into an intermediate frequency signal IF1 and an intermediate frequency signal IF2.
(d5) The intermediate frequency signal IF1 enters an AGC detection module 9 to obtain a direct current voltage, and the direct current voltage is amplified by an operational amplifier A11 to generate a closed-loop AGC voltage VAGCControlling the gains of the first intermediate frequency amplification module 5 and the second intermediate frequency amplification module 7 to realize the automatic closed-loop control of the equipment gain; the direct-current voltage obtained by the AGC detection module 9 is amplified by an operational amplifier B12 to generate a 0-5V closed-loop AGC telemetering voltage VAGCTM1Outputting the data as a judgment basis of system capture and lock loss;
(d6) the intermediate frequency signal IF2 enters the envelope detection module 10, and the angle error signal is detected and output.
(2) Extreme tracking mode
(j1) The ground sends a working mode switching instruction, switches the alternative switch A14 to output gain control voltage, and switches the alternative switch B15 to output open-loop AGC telemetering voltage VAGCTM2(ii) a Meanwhile, a power-off instruction of the differential branch low-noise amplification module is sent on the ground;
(j2) according to the characteristics and level range of a target signal, a gain control voltage is externally input to control the gains of the first intermediate frequency amplification module 5 and the second intermediate frequency amplification module 7, and the specific method is as follows:
the input sum signal Σ is shifted in the dynamic range (e.g., 7dB shift, for a total of 6 shifts), each shift corresponding to a corresponding gain control voltage. Injecting a gain control voltage according to the characteristics of a signal to be tracked, controlling the channel gains of the first intermediate frequency amplification module 5 and the second intermediate frequency amplification module 7, and ensuring that the IF power of an intermediate frequency signal output by the second intermediate frequency amplification module is more than or equal to 9dBm within the range of 7dB of an input sum signal per gear;
(j3) the sum signal sigma passes through the sum branch low-noise amplification module 1, the tracking modulation module 3, the first mixing module 4, the first intermediate frequency amplification module 5, the second mixing module 6 and the second intermediate frequency amplification module 7, and an intermediate frequency signal IF with the output frequency of 70MHz and the power of more than or equal to 9dBm is output.
(j4) The intermediate frequency signal IF passes through the power division module 8 and is divided into two intermediate frequency signals IF1 and intermediate frequency signal IF2.
(j5) The intermediate frequency signal IF1 enters an AGC detection module 9 to obtain a direct current voltage, and the direct current voltage is amplified by an operational amplifier C13 to generate an open-loop AGC telemetering voltage VAGCTM2Outputting the voltage range of 0-5V as a judgment basis for the rotation of the extreme value tracking antenna;
(j6) the intermediate frequency signal IF2 enters the envelope detection module 10 and the output signal is not further processed.
The tracking receiver channel compatible with the two tracking systems is developed in the second generation relay satellite model, and is tested and verified, and a single-channel single-pulse tracking system and an extreme value tracking system can be compatible through a working mode instruction change-over switch; under the working condition that the dynamic range of an input signal is-100 dBm to-60 dBm, the AGC telemetering resolution required by extreme value tracking is improved from 0.1V/dB to 0.6V/dB.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (9)
1. A tracking receiver channel compatible with two tracking regimes, comprising: the device comprises a sum branch low-noise amplification module (1), a difference branch low-noise amplification module (2), a tracking modulation module (3), a frequency conversion and amplification module, a power division module (8), an AGC detection module (9), an envelope detection module (10), an operational amplifier A (11), an operational amplifier B (12), an operational amplifier C (13), an alternative switch A (14) and an alternative switch B (15); the frequency conversion and amplification module comprises a first frequency mixing module (4), a first intermediate frequency amplification module (5), a second frequency mixing module (6) and a second intermediate frequency amplification module (7);
when the alternative switch A (14) is switched to output closed-loop AGC voltage, the alternative switch B (15) is switched to output closed-loop AGC telemetering voltage VAGCTM1When the channel enters a single-channel single-pulse tracking mode, the alternative switch A (14) outputs AGC voltage VAGCThe frequency conversion and amplification module is used for realizing gain closed-loop control; alternative switch B (15) outputs closed-loop AGC telemetering voltage VAGCTM1Used for catching, losing the lock judgement;
when the alternative switch A (14) is switched to output the gain control voltage and the alternative switch B (15) is switched to output the open-loop AGC telemetering voltage VAGCTM2When the channel enters an extreme value tracking mode, the alternative switch A (14) outputs gain control voltage to the frequency conversion and amplification module to realize gain open-loop control; the alternative switch B (15) outputs open-loop AGC telemetering voltage VAGCTM2The method is used for extreme value tracking judgment;
the sum branch low-noise amplification module (1) performs low-noise amplification on the sum signal sigma and outputs the sum signal sigma to the tracking modulation module (3); the difference branch low-noise amplification module (2) performs low-noise amplification on the difference signal delta and outputs the difference signal delta to the tracking modulation module (3);
under a single-channel single-pulse tracking mode, a tracking modulation module (3) carries out phase shift modulation processing on the received sum signal and the received difference signal to obtain an amplitude-modulated single-channel single-pulse signal, and the amplitude-modulated single-channel single-pulse signal is output to a first frequency mixing module (4); in an extreme value tracking mode, the tracking modulation module (3) is only used as a channel of a sum signal, and the received sum signal is directly output to the first frequency mixing module (4);
the frequency conversion and amplification module carries out frequency conversion and gain amplification processing on an output signal of the tracking modulator (3) by using an external input local oscillation signal to obtain an intermediate frequency signal IF, and the intermediate frequency signal IF is output to the power division module (8);
under single-channel single-pulse tracking mode, one-out-of-two switch A (14) outputs AGC voltage VAGCTo a first intermediate frequency amplification module (5) and a second intermediate frequency amplification module (7) to realize gain closed-loop control;
under an extreme value tracking mode, the alternative switch A (14) outputs gain control voltage to the first intermediate frequency amplification module (5) and the second intermediate frequency amplification module (7) to realize gain open-loop control;
the first frequency mixing module (4) utilizes a first local oscillator signal input from the outside to perform signal down-conversion on an output signal of the tracking modulator (3) to obtain a first intermediate frequency signal, and the first intermediate frequency signal is output to the first intermediate frequency amplification module (5);
the first intermediate frequency amplification module (5) performs gain amplification on the first intermediate frequency signal and outputs the first intermediate frequency signal to the second frequency mixing module (6);
the second frequency mixing module (6) performs signal down-conversion on the output signal of the first intermediate frequency amplification module (5) by using a second local oscillator signal input from the outside to obtain a second intermediate frequency signal, and outputs the second intermediate frequency signal to the second intermediate frequency amplification module (7);
the second intermediate frequency amplification module (7) performs gain amplification on the received signal to obtain an intermediate frequency signal IF, and outputs the intermediate frequency signal IF to the power division module (8);
the power dividing module (8) divides the IF equal power into two paths, one path is an IF signal IF1, and the two paths are output to the AGC detection module (9); the other path is an intermediate frequency signal IF2 which is output to an envelope detection module (10);
an AGC detection module (9) detects the power of an input intermediate frequency signal IF1, obtains a direct current voltage which is in direct proportion to the power of the input signal, and simultaneously outputs the direct current voltage to an operational amplifier A (11), an operational amplifier B (12) and an operational amplifier C (13) for amplification;
an envelope detection module (10) removes a carrier wave of the intermediate frequency signal IF2, extracts an angle error signal envelope, and outputs an angle error signal after amplification;
the operational amplifier A (11) performs operational amplification on the direct current voltage output by the AGC detection module (9) and outputs a closed-loop AGC voltage V to the alternative switch A (14)AGC(ii) a The operational amplifier B (12) operates and amplifies the direct current voltage output by the AGC detection module (9) and outputs a closed-loop AGC telemetering voltage V to an alternative switch B (15)AGCTM1(ii) a The operational amplifier C (13) operates and amplifies the direct current voltage output by the AGC detection module (9) and outputs open-loop AGC telemetering voltage V to the alternative switch B (15)AGCTM2。
2. A tracking receiver channel compatible with both tracking regimes as claimed in claim 1 wherein: the tracking modulation module (3) comprises a sum channel phase shifter (31), a difference channel modulator (32) and a combiner (35);
in a single-channel single-pulse tracking mode, a sum channel phase shifter (31) completes phase shift within the range of 0-360 degrees of a sum signal according to an external instruction; the difference channel modulator (32) performs four-phase modulation on the input difference signal under the control of the reference signals f1(t) and f2 (t); a combiner (33) adds the phase-shifted and modulated sum signal and difference signal to form an amplitude-modulated single-channel single-pulse signal;
in an extreme value tracking mode, a difference channel modulator (32) in the tracking modulation module (3) does not work, the sum channel phase shifter (31) is arranged at a fixed phase, and the tracking modulator (3) is only used as a channel of a sum branch signal.
3. A tracking receiver channel compatible with both tracking regimes as claimed in claim 2 wherein: the modulation timing for four-phase modulation of the input difference signal by the difference channel modulator (32) is 0 ° - >90 ° - >270 ° - >180 °.
4. A tracking receiver channel compatible with both tracking regimes as claimed in claim 3 wherein: the reference signals f1(t) and f2(t) are phase coherent square wave signals with a duty cycle of 50%, and the frequency of f1(t) is 2 times that of f2 (t).
5. A tracking receiver channel compatible with both tracking regimes as claimed in claim 1 wherein: the difference signal delta is a difference signal output by the antenna feed source, is a vector sum of the azimuth difference signal delta A and the elevation difference signal delta E, and is orthogonal to delta A and delta E.
6. A tracking receiver channel compatible with both tracking regimes as claimed in claim 5 wherein: the sum signal Σ is a sum signal of the feed output, Σ being in phase with Δ a, Δ E being perpendicular to Δ a.
7. A tracking receiver channel compatible with both tracking regimes as claimed in claim 1 wherein: the single-channel single-pulse tracking mode is realized as follows:
(d1) the ground sends a working mode switching instruction to switch an alternative switch A (14) to output a closed-loop AGC voltage VAGCSwitching the alternative switch B (15) to output a closed loop AGC telemetry voltage VAGCTM1；
(d2) The sum signal sigma passes through the sum branch low-noise amplification module (1), the difference signal delta passes through the difference branch low-noise amplification module (2), and then enters the tracking modulation module (3), and the tracking modulation module (3) outputs an amplitude-modulated single-pulse single-channel signal after processing;
(d3) the amplitude-modulated single-pulse single-channel signal sequentially passes through a first frequency mixing module (4), a first intermediate frequency amplification module (5), a second frequency mixing module (6) and a second intermediate frequency amplification module (7) and then outputs an intermediate frequency signal IF;
(d4) the intermediate frequency signal IF passes through a power division module (8) and is divided into an intermediate frequency signal IF1 and an intermediate frequency signal IF 2;
(d5) the intermediate frequency signal IF1 enters an AGC detection module (9) to obtain a direct current voltage, and the direct current voltage is amplified by an operational amplifier A (11) to generate a closed-loop AGC voltage VAGCThe gain of the first intermediate frequency amplification module (5) and the gain of the second intermediate frequency amplification module (7) are controlled, and automatic closed-loop control of the equipment gain is realized; the direct current voltage obtained by the AGC detection module (9) is amplified by an operational amplifier B (12) to generate a closed-loop AGC telemetering voltage VAGCTM1Output as system capture,The basis for judging lock losing;
(d6) the intermediate frequency signal IF2 enters the envelope detection module 10, and the angle error signal is detected and output.
8. A tracking receiver channel compatible with both tracking regimes as claimed in claim 1 wherein: the extreme value tracking mode is realized as follows:
(j1) the ground sends a working mode switching instruction, switches an alternative switch A (14) to output a gain control voltage, and switches an alternative switch B (15) to output an open-loop AGC telemetering voltage VAGCTM2(ii) a Meanwhile, a power-off instruction of the differential branch low-noise amplification module is sent on the ground;
(j2) according to the characteristics and the level range of a target signal, gain control voltage is input from the outside, and gains of a first intermediate frequency amplification module (5) and a second intermediate frequency amplification module (7) are controlled;
(j3) the sum signal sigma sequentially passes through a sum branch low-noise amplification module (1), a tracking modulation module (3), a first mixing module (4), a first intermediate frequency amplification module (5), a second mixing module (6) and a second intermediate frequency amplification module (7) to output an intermediate frequency signal IF;
(j4) the intermediate frequency signal IF passes through a power division module (8) and is divided into two paths of intermediate frequency signals IF1 and intermediate frequency signals IF 2;
(j5) the intermediate frequency signal IF1 enters an AGC detection module (9) to obtain a direct current voltage, and the direct current voltage is amplified by an operational amplifier C (13) to generate an open-loop AGC telemetering voltage VAGCTM2And outputting the signal as a judgment basis for the rotation of the extreme value tracking antenna;
(j6) the intermediate frequency signal IF2 enters the envelope detection module (10) and the output signal is not further processed.
9. A tracking receiver channel compatible with both tracking regimes as claimed in claim 8 wherein: in the step (j2), a specific method of gain control is as follows:
the input sum signal Σ is stepped in a dynamic range, each step mdB corresponding to a respective gain control voltage; injecting a gain control voltage according to the characteristics of a target signal to be tracked, controlling the channel gains of the first intermediate frequency amplification module (5) and the second intermediate frequency amplification module (7), and ensuring that the IF power of an intermediate frequency signal output by the second intermediate frequency amplification module is more than or equal to 9dBm within the range of mdB of each level of input sum signals; m is a natural number other than 0.
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